Arduino IDE: Where can I pass defines to the compiler?

smorra · November 1, 2020, 11:09am

I want to pass several defines to the compiler during compilation.
For example:

#define ENABLE_SSL 1

I know from C/CPP that these defines are normally set in the Makefile like this:

CPPFLAGS = -DENABLE_SSL

These defines are then passed to every source file during compilation.
(Even source files which are not my own.)

Is this possible with the Arduino IDE?

Please don't tell me to set the defines in my source code.
I'm looking for a solution to set the defines in the IDE or in a configuration/make file.

Juraj · November 1, 2020, 11:18am

https://forum.arduino.cc/index.php?topic=710128.msg4771134#msg4771134

pert · November 1, 2020, 12:42pm

You can also do it via the --pref option of the Arduino IDE's command line:

github.com

arduino/Arduino/blob/master/build/shared/manpage.adoc

// Generate a manpage with: a2x -f manpage manpage.adoc
// or HTML with: a2x -f xhtml manpage.adoc
//
// This file uses {empty}:: in some places, to allow putting multiple
// paragraphs inside a single label list item. This is a bit ugly and
// non-semantic, but it seems this is the best way to do this. Asciidoc
// also supports putting a plus sign on a line by itself to join two
// paragraphs into a single list item. However, the indentation on the
// second paragraph makes that formatted with a fixed-size font.
// Removing the indentation completely makes the asciidoc source very
// unreadable. Also, for the --board option, there is a a paragraph,
// followed by a list, followed by another paragraph. The + approach can
// only put the latter paragraph into the inner list, not the outer
// one...

ARDUINO(1)
==========
:doctype: manpage

NAME

This file has been truncated. show original

arduino --pref compiler.cpp.extra_flags=-DENABLE_SSL

Will set it for all C++ files, including the .ino/.pde files of the sketch. There is also a property for C files: compiler.c.extra_flags

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Arduino IDE: Where can I pass defines to the compiler?

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